Low jitter timing recovery technique and device for...

H - Electricity – 04 – L

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H04L 12/56 (2006.01) H04J 3/06 (2006.01) H04L 7/00 (2006.01)

Patent

CA 2250387

An existing synchronous residual time stamp (SRTS) algorithm (76, 78, 80, 82, 106, 104) is used in conjunction with adaptively filtered buffer fill information (74) to reconstruct an original constant bit rate (CBR) payload clock rate (102) for asynchronous transfer mode (ATM) CBR payloads (88, 96). The SRTS time stamp (96) is used as the primary factor used to recover the payload clock rate, but a secondary payload frequency correction factor (112) is generated by filtering (118, 120) the desynchronizer buffer fill position. This correction factor is determined as part of a feedback arrangement which adaptively (128) alters the filtering time constant based on the offset position of the buffer from its center. In this way, payload clock frequency (102) is corrected, even in the presence of loss of synchronization PRS traceability between mapping and desynchronizer nodes to keep the desynchronizer buffer from overflowing.

Un algorithme d'horodatage résiduel synchrone courant (76, 78, 80, 82, 106, 104) est utilisé conjointement avec une information de remplissage de tampon filtrée adaptativement (74) afin de recouvrer le débit d'horloge binaire constant originel (102) de la charge utile (88, 96) en mode de transfert asynchrone (MTA). L'horodatage résiduel synchrone (96) est utilisé comme facteur primaire pour recouvrer le débit d'horloge de la charge utile, mais un facteur secondaire de correction de la fréquence de la charge utile (112) est obtenu par un filtrage (118, 120) de la position de remplissage du tampon de désynchronisation. Ce facteur de correction est déterminé dans le cadre d'une rétroaction qui modifie adaptativement (128) la constante de temps de filtrage d'après le décalage du tampon par rapport à sa position médiane. Ceci corrige la fréquence d'horloge de la charge utile (102), même en cas de perte de synchronisme entre les noeuds de mise en correspondance et les noeuds de désynchronisation, pour empêcher le débordement du tampon de désynchronisation.

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